Marshall Jcm800Pre 2204 Mv50 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JCM800 2204 is the 50W version of the 2203 Master Volume head, equally iconic in the hard rock and metal canon. Its tight low end and singing lead tone made it a studio and stage staple throughout the 1980s and beyond.

• Years produced: 1981–1990
• Made in: UK
• Wattage: 50W
• Channels: 1
• Preamp tubes: 4× ECC83
• Power tubes: 2× EL34

Known for: Slash, The Cult, Dave Murray, Adrian Smith, Gary Moore.

Heard on: Welcome to the Jungle — Guns N' Roses (1987); Crazy Train — Ozzy Osbourne (1980).

Tags: british, crunch, vintage, 80s-rock.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.